So, Angee (my sister from another mister) and anyone listening in. I'm sure you're aware Jem & The Holograms was a cartoon.
I used to watch when I was about five.
I don't remember any episodes whatsoever, but when it was cool for me to say so I said I remembered one about some guy on drugs jumping out a window. And this cartoon was for children??!
Incidentally, I think this may be the episode. Not featuring the rock band but still some scary pyrotechnics at work -- for a five year-old.